“Far from putting doubts and anxieties to rest religion often has the effect of intensifying them. It judges those who profess the faith more harshly than it judges unbelievers. It holds them up to a standard of conduct so demanding that many of them inevitably fall short. It has no patience with those who make excuses for themselves--an art in which Americans have come to excel. If it is ultimately forgiving of human weakness and folly, it is not because it ignores them or attributes them exclusively to unbelievers. For those who take religion seriously, belief is a burden, not a self-righteous claim to some privileged moral status. Self-righteousness, indeed, may well be more prevalent among skeptics than among believers. The spiritual discipline against self-righteousness is the very essence of religion.”